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Acceleration missed in the transient modal analysis
Posted Mar 20, 2017, 12:28 p.m. EDT Results & Visualization, Structural Mechanics Version 5.0 0 Replies
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I've got a little issue with comsol during the modellation of a relative simple problem.
I have a plate, impacted in the middle of its surface. I would like to make a simulation in two phases. The solid part of the plate, and the air around 20mm from the surface. In this way, I would like to simulate the acceleration of the plate, due to the impact, and the acoustic pressure in its prossimity.
What I particullary care is the damping of the material (5%), and the modal interaction due to materials, geometry and boundary conditions.
I tried the transient modal analysis, but for some reason that I miss, it gives me the displacemente and the velocity of the plate, but not the acceleration. Now, this is not a big issue, since I could derive the velocity plot in time to have the acceleration. The problem is about the acoustci pressure, that seems is not calculated as well as the acceleration.
I tried the only transient analysis too, but in this case the modal shapes neither the damping factor are considered. It returns acceleration and acoustic pressure, but they are strongly affected by the modal and damping errors.
Could someone help me and suggest the best way to simulate a problem relatively simple such this one?
Thank you very much in advance.
Hello Marco Scattarreggia
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